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Solved: Speedtest.net showed good ping and upload but slow download

During installation, K found incompatible software: CheckPoint VPN driver and Spybot S&D. I took the offered option to continue installation without removing incompatible software.

Installation of KAV 2013 bombed, forcing me to do a hard shut-down

I tried fixing KAV 2012 by using the KAV 2012 CD. This failed.

Accidentally, I booted from the KAV 2012 CD; it ran as a rescue disk. This got KAV 2012 working again.

Some weeks later, this PC experienced intermittently slow download, according to speedtest.net (and the user's experience). This PC was connected via Ethernet to a router. A laptop, connected wirelessly, showed not degradation. It was running KAV 20121 and ZAF 11 For the third PC, connected via Ethernet, also running KAV 2012 and ZA 11, speedtest.net showed ping of 73 mSecs (OK, but not the best) and download of 90% of ISP's spec, although rate varied during the test.

After suspecting a cable (which is built in to the walls), I removed ZA 11 from the offending PC. This fixed the problem.

Here's what I think happened: when I restored KAV using its CD as a rescue disk, KAV got installed on top of ZA. This used to be a no-no, in the days of ZA 5 and ZA6. It appears still to be a problem.

It certainly didn't help that KAV only suggested removal of incompatible software, rather than demanding it. It also didn't help that K identified ZoneAlarm as "Checkpoint VPN driver": I didn't know what it was, and when I clicked on "Remove", K didn't either: it opened Add/Remove Programs, so I could do the removal from there!